Jib-crane.



E. Y'. MOORE.

.HB CRANE.

APPucATlou msn APRA. 1911.

E. Y. MODRE.

1m CRANE.

AFPLICA'ION FILED APR. 3| |917 3 SHEETS-SHEET 2.

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E. Y. MOORE.

JIB CRANE.- APPLlcAUoN man APR.9.1911.

l ,284,745. Patented Nov. 12, 1918.

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EDWARD Y. MOORE, OF CLEVELAND, OHIO.

J' IB- CRANE.

Specification of Letters Patent.

Patented Nov. 12, 1918.

Application led April 9, 1917. Serial No. 160,602.

To all whom t may concern:

Be it known that I, EDWARD Y. MOORE, a citizen of the United States,residing at Cleveland in the county of Cuyahoga and State of' hio, haveinvented a certain new and useful Improvement in Jib-Cranes, of whichthe following is a full, clear, and exact description, reference beinghad to the accompanying drawings.

This invention relates to jib cranes having an outstanding arm arrangedto swing about a vertical axis and provided with suitable hoistingmechanism having a flexible raising member depending from the outerportion of the arm. The invention is more particularly concerned withsuch a jib crane which is arranged to be supported above and below on avertical post or wall and has an upright frame member which supports theoutstanding arm and carries the hoisting mechanism proper, the flexibleleft member thereof being guided outwardly on the arm and thendepending. The obj ect of the invention is to simplify and cheapen theconstruction of a jib crane of the type mentioned, pro ducing a cranewhich is effective and strong, and at the same time is comparativelylight and compact. The invention is hereinafter more fully described andits essential characteristics are summarized in the claims.

In the drawings, Figure 1 is a side elevation of my jib crane complete;Fig. 2 is an edge elevation on an enlarged scale of the upright frameand the hoisting mechanism it carries, this view being at right anglesto Fig. l; Fig. 3 is a horizontal section through the crane just abovethe hoisting mechanism; Fig. 4 is a vertical section through the uprightand the hoisting mechanism, as indicated by the line 4 4 on Fig. l; Fig.5 is a horizontal section through the upper portion of the upright, asindicated by the line 5 5 on Fig. 1; Fig. 6 is an enlarged verticalsection of the hand wheel and braking clutch controlled thereby; Fig. 7is a face view of the clutch, being a section through the main shaft ofthe hoisting mechanism on the inner side of the hand wheel; Fig. 8 is anend view of the horizontal arm of the frame, showing also the lift hookon the flexible raising member; Fig. 9 is detail of the lift hook, beinga vertical section through it in a plane at right angles to Fig. 8; Fig.10 is a detail of a portion of the ji'b arm, eing a section on the line10-.10 of Fig, l; Fig, 1l is an elevationofone of the brackets in whichthe vertical arm is supported. i

As shown in Fig. l, 10 designates any suitable vertical support for theframe. The support shown may be considered an upright I-beam havingflanges 11. 12 and 13 indicate two horizontal channel members which areshown as secured tothe I-beam. The crane proper is carried by bracketssecured, in the embodiment shown, to the I- beam and to the horizontalchannel members.

The brackets mentioned are designated respectively 2O and 21; theymay beidentical, one facing downwardly and the other upwardly. Each brackethas a cylindrical boss 22 with a vertical recess in it, a vertical web23 extending from the boss, a horizontal flange 24 extending each sideof the web, and vertical flanges 25 extending from the web. As shown,anges 24 extend across the corresponding channel beam and are boltedthereto by bolts 2G. The ianges 25 lie against the web of the channelsand are secured by bolts 27 which pass throuo'h such web and through theflange 11 of the supporting beam 10.

It is to be understood that the form of the brackets 20 and 21 will varyaccording t0 the members to which they are to be secured. The recessesin the bosses of these two brackets, facing downwardly and upwardlyrespectively, `provide means for swiveling the crane frame, which willnow be described.

The upright frame of the crane is shown as consisting of two verticalchannel beams 30, 31, placed with their backs toward each other andspaced by blocks 33 and 34 between the channel beam at their upper andlower ends. The beams are secured to these blocks by bolts 35 and 36,which pass through the webs of' the channels and through the blocks. Theblocks 33 and 34 may readily be flanged malleable castings. They havevertical recesses in which are set pins 37 and 38 which enter therecesses of the brackets 2O and 21 and swivel the upright frame thereto.The pins 37 and 38 preferably fit tightly in their cavities in theblocks and are further locked thereto by transverse pins 39 projectinginto openings in the blocks.

The horizontal arm of the frame consists essentially of a. pair ofhorizontal channel beams 40V ancll secured tothe upright chan nels. Asshown these horizontal channels have their tlanges l2 and t3 out away sothat their ends abut the face of one of the flanges of the upright.channels, while the web portion ist of the horizont-al channel continuedbetween the webs of the vertical channels, as shown at 15 in Fig. 3, andsecured thereto. l also provide triangular gusset plates 50, which aresecured to the upright channels and horizontal channels and help supportthe horizontal channels. These gusset plates extend alongside of theinwardly projecting portion of the channel webs and filler plates 51below such webs, and suitable bolts pass through the gusset plates, thechannel webs, the ller plates and the upright channels. Such bolts areshown at 5:2 in dotted lines in Fig. 1, and one pair of them appears intull lines in Fig. 1. The horizontal channels are furthe-r braced by atop plate t3. secured to the upper flanges To torni effective bearingstor the shafts of the. hoisting mechanism and to carry the hand wheeland gearing beyond the flanges of the upright channels, l secure a pairot' brackets and 61 to the outer sides ot these upright channels betweentheir flanges. These brackets have end portions which bear against theouter faces ot the channel webs and are bolted to them. Theirintermediate portions stand a suitable distance awa-y from those webs soas to properly support the hand wheel and gearing without being un dulybulky. As shown, the two brackets 60 and 61 are secured at tlheir upperends by the pair of bolts 36 which pass through the block 33. Near theirlower ends the brackets 60, 61 are secured by the through. bolts 63,which between the channels occupy distance sleeves 64.

indicates the main shaft of the hoisting mechanism. This shaft extendsthrough the two upright channel beams and has bearings in the twobrackets 60 and 61. On one end it carries the hand wheel 'T2 which mayrotate it, as hereinafter explained, and on the other end it carries aspur gear 73. which meshes with a gear ou a shaft 76 also journaled inthe brackets 60 and 61. This shaft 76 carries a spur pinion 77 meshingwith spur gear teeth 30 termed on the pocket wheel 81. This, pocketwheel or litt wheel is journaled on a stationary sleeve 83 surroundingthe itt 70 and having its ends mounted in the gus t plates 50.

lt results from the above construction that it' the shaft 70 be rotated,the pocket wheel 31 will be rotated, at a correspondingly reduced speed.llxtending over this pocket .iheel is the litt chain 90. This chaindepends idly on the side of the pocket wheel toward the support, passesover the upper side of the pocket wheel and extends ap proximatelyhorizontally, but somewhat downwardly, between the horizontal channelsand beneath a guide pulley 92, carried thereby, and then upwardly overanother pulley 93. These pulleys are journaled on axles 96 carried bybrackets 9% secured to the inner tace o'l' the channels by bolts 95, asshown in Fig. 10. The construction is the same at the pulley 93, exceptthat that pulley is located centrally, as shown in Fig. 8, whereas theintermediate pulley 92 is prefcrably in a line between the end pulleyand the lift wheel 81.

By providing the guide pulley 9:2, which bends the lift chain downwardlybetween the pulley 93 and the liit wheel 81, l prevent the chainvibrating up and down in tthe. horizontal arm, and I insure it beingwrapped a suthcient distance about the litt wheel 81 so that it will beeffectively pulled when the litt wheel is rotated.

The end ot the lift chain carriesl a suitable hook 'tor supporting theload. l have shown for this purposel a biturcated hook 97 which mayengage a chain 98 secured to the load. The hifurcated portion of thehook 98 has inwardly projecting ribs 99 which. are adapted to embrace alink standing edgewise and extend between links standing crosswise otthe chain 98 and thus support it.

To provide a suitable brake or clutch to hold the load in any desiredsuspended position, I provide mechanism similar to that shown in myprior patent No. 7 94,997, and there claimed. This mechanism is hereshown in Figs. l, 6 and 7, and will now be described.

Rigidly keyed on the main shaft 70 is a collar 100 which has both around and a square portion. Bearing on the round portion is a cup 101having ratchet teeth 10Ql on its periphery. In the wall of this cup area pair of diametrically opposite notches 103. In the cup are a series ofdisks 105 alternately connected to the collar 100 and to the cup wall.To effect this I make one disk with a round opening at its center andlugs 104 at its periphery which seat in the notches 103, wherefore suchdisk is rotatable with the cup. The next disk has a round periphery anda square hole in its center engaging the square portion 106 of thecollar so that this disk is rigid with the collar. 110 indicates asuitable pressure plate bearing against the adjacent disk and giving atendency to move away :trom the cup by suitable springs 111. The handwheel 72 is journaled loosely on the. shaft 70, bearing at its inneredge against the pressure plate 110 and at its outer end having aninclined surface 115, bearing against an incline 116 on a collar 117,rigidly secured to the shaft. The lug 116 extends into a notch in thehub of the hand wheel, but the `hand wheel, it will be seen, has somemovement. independently of the shaft and collar 117.

To raise the load the hand wheel is turned by the hand chain 120 in thedirection to shove its hub toward the upright beam. This forces thepressure plate 110 against the disks, and clamps the movable clutchdisks tightly against the ratchet cup 101, so that this cup rotates withthe hand wheel. A suitable pawl 118 carried by the bracket 60 liesagainst the ratchet and clicks idly under it in this raising movement.Whenever the raising rotation of the hand wheel stops, the pawl holdsthe load in such posit-ion.

To lower the load the hand wheel is turned by its chain 120 in theopposite direction, which causes it to travel back on the incline 116,releasing the clutch. This frees the ratchet from the shaft.Accordingly, if the hand wheel be rotated in advance of the rotation ofthe shaft 70, given by the gravity of the load, the clutch will bemaintained out of engagement, and the load will run down, as desired. Atany time, the descent of the load may be stopped by simply stopping this`backward rotation of the hand wheel.

Having thus described my invention, what I claim is:

1. In a jib crane, the combination of ,a frame comprising two uprightchannels with their flanges facing outwardly and distance pieces betweenthe channels near their upper and lower ends secured to them, ahorizontal arm comprising two channels with their flanges facingoutwardly and their webs continued between the upright channels, a pairof vert-ical gusset plates, said gusset plates and the vertical andhorizontal webs lying side by side, a shaft extending through the gussetplates and the overlapped webs, a lift wheel on said shaft, and aflexible raising member extending therefrom outwardly between thechannels of the horizontal arm.

2. In a jib crane, the combination with a suitable support, of aswiveled upright comprising two outwardly facing channel beams withdistance blocks between them adjacent to their upper and lower ends,horizontal arms comprising two structural shapes having webs extendingonto the inner faces of the upright channel webs, brackets on the outerside of the upright channels between their flanges and secured to thechannels, opposite the overlapping webs mentioned, a lift wheel ybetweenthe channels, a transverse shaft mounted in said brackets, suitablegearing between said shaft and said lift wheel, and a fiexible memberlying over the lift wheel and extending -outwardly along the horizontalarm.

In testimony whereof I hereunto affix my signature.

EDWARD Y. MOORE.

Copies of this patent may he obtained for ve cents each, by addressingthe Commissioner of` Patents, Washington, D. C.

